I think this was recently discussed and Dave Garrett made a tutorial concerning it (google for his website). Basically, it involves to making a menu with different pictures for each button outside the button itself on the menu. Then you make a highlight layer that covers the pictures that you want for the fake highlights. Then you go to the subpicture highlights and set the “normal” color for the highlight at 100% and make the color the same color as the background.
Set the seoected opacity to 0%. This uncovers each picture you have selected for the highlight.
Unfortunately, I think when you come back from selecting from the button, you briefly show all of the fake highlights briefly. If I remember correctly, that’s as close as you can come with Encore.
John